French decimal time clock, By Cormullion, Own work [CC BY-SA 3.0], via Wikimedia Commons There were a few attempts in France to switch to decimal time. The first began use in 1794 during the ...

This decimal clock was made by Pierre Daniel Destigny in Rouen, France, between 1798 and 1805. | DeFacto, Wikimedia Commons // CC BY-SA 4.0 Everybody knows that there are 24 hours in a day ...